What happens to a modern penny when it is placed inside a bath of hydrochloric acid after the penny is scratched, exposing some of the zinc?

Q: Write the net ionic equation for the reaction that occurs, if any, when solutions of the following…

A: The aqueous solutions of sodium bromide, NaBr and lead nitrate Pb(NO3)2 are mixed.

Q: student mixes phosphoric acid and sodium hydroxide in a neutralizationreaction. Write the balanced…

A: To write the balanced chemical equation for the neutralization reaction between phosphoric acid…

Q: Complete the following word equation.Solute + Solvent →

A: A solution is a homogeneous mixture of two substances. A homogeneous mixture in which the…

Q: What do you observe when hydrated copper (II) sulphate is heated?

A: Hydrated copper (II) sulfate has 5 molecules of water of crystallization and when it is heated it…

Q: A chemist places 2.9764 g of NaCl in a 100 mL volumetric flask and adds water to the mark and calls…

A: Given, Stock Solution 1 : mass of NaCl = 2.9764 g volume of flask = 100 mL Solution 2 : Volume…

Q: Calculate the total mass, in kilograms, of arsenic in the lake that the company will have to remove…

A: Sample of water : 178.9 ng Density of water : 1.0 g/cm Volume of water : 0.350 km3  1) First of all…

Q: Suppose you have 50. mL of 0.333 M magnesium acetate. You transfer 5.00 mL of this solution to a…

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Q: A student dropped few pieces of marble in dilute HCI contained in a test tube. The gas evolved was…

A: SOLUTION: Step 1: Marble is chemically calcium carbonate. When dilute HCl is added to calcium…

Q: Write a balanced reaction (using the smallest whole-number coefficients) for the decomposition of…

A: We are to write the reaction for decomposition of nitrogen dioxide into oxygen gas and notrogen…

Q: Potassium sulfate solution reacts with barium bromide solution to produce a precipitate of barium…

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Q: Explain the principle of the method of electrolytic refining of metals. Give one example.

A: Extraction of metals in the pure form is done by the process of metallurgy. It follows several…

Q: A blue crystal is placed in water. After stirring, the crystal disappears and the water becomes…

A: A chemical reaction is a process in which one or more substances known as reactants are converted to…

Q: A chemist must dilute 44.8mL of 4.18M aqueous sodium chloride (NaCl) solution until the…

A: Molarity is one of the terms that can be used to express the concentration of the solution. We…

Q: The reaction between an acid and salt is: Oxidation Precipitation Neutralization Hydrolysis

A: Acid is a substance which can donate Hydronium ion or proton in an aqueous solution . Substance…

Q: In the following chemical reaction (when balanced), the correct coefficient of aluminum is Blank 1,…

A: A balanced chemical reaction is the one where the number of atoms of each element is same on both…

Q: predict the reaction type (single or double displacement) -- predict the names and states of the…

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Q: A student dropped few pieces of marbles in dilute hydrochloric acid, contained in a test tube. The…

A: Marble is chemically calcium carbonate. When dilute HCl is added to calcium carbonate, it forms…

Q: Classifying chemical reactions helps chemists to predict the possible products that will form (1)…

A: Chemical reaction is the conversion of one or more reactants into one or more products. Reactants…

Q: A chemistry student needs to standardize a fresh solution of sodium hydroxide. He carefully weighs…

A: Given that : The mass of oxalic acid = 50 mg The volume of distilled water = 250ml The volume of…

Q: Over coffee and croissants at breakfast one day, your friend Tom (an expert chemist) says this:…

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Q: Define how Solid lead (II) sulfide reacts with aqueous hydrochloric acid to produce solid lead (II)…

A: Solid lead(II) sulfide reacts with aqueous hydrochloric acid to form solid lead(II) chloride and…

Q: Determine which two of the following reactions are redox reactions. If the reaction is a redox…

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Q: Consider two aqueous solutions: one of ammonium carbonate and one of barium nitrate.  List the ions…

A: The solubility of barium carbonate is very low in the water. When ammonium carbonate reacts with…

Q: A student does an experiment to determine where titanium metal should be placed on the activity…

A: Given: Nickel(II) nitrate, Lead(II)nitrate and Magnesium nitrate solutions.

Q: Write the steps of systematic analysis of the cations indicated in a sample solution containing…

A: We have given a sample solution containing ions of lead, silver, copper, nickel, bismuth and tin.

Q: Part of a routine blood test is to check the level of sodium in your blood. It is optimum to have…

A: Given:Determine the minimum mass of Na-146.The molarity of a solution is defined as the moles of…

Q: Which solid precipitate(s) may be produced when the following four aqueo solutions are mixed…

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Q: To determine the mass of calcium carbonate present in a 0.125 g sample of chalk, the chalk sample…

A: Acid-base titrations can be used to find the concentration of unknown acid/base by titrating it…

States of Matter

The substance that constitutes everything in the universe is known as matter. Matter comprises atoms which in turn are composed of electrons, protons, and neutrons. Different atoms combine together to give rise to molecules that act as a foundation for all kinds of substances. There are five states of matter based on their energies of attraction, namely solid, liquid, gases, plasma, and BEC (Bose-Einstein condensates). 

Chemical Reactions and Equations

When a chemical species is transformed into another chemical species it is said to have undergone a chemical reaction. It consists of breaking existing bonds and forming new bonds by changing the position of electrons. These reactions are best explained using a chemical equation.